JPH04245489A - Power-supply device - Google Patents

Abstract

PURPOSE:To offer a power-supply device, in which the turn-ON time of switching elements 22 and 23 in a drive switching circuit 2 can be set short and the safe operating areas of the elements 22 and 23 can be set wide for the setting of the turn-ON time. CONSTITUTION:In a power-supply device which supplies power from a charging power supply 1 to an excitation lamp 3 of a solid pulse laser by a drive switching circuit 2, the above drive switching circuit 2 is provided with a capacitor 21 connected to the above power supply 1, a plurality of pieces of switching elements 22 and 23 connected in parallel between this capacitor 21 and the above lamp 3 and a control circuit 26 which turns-ON in order these elements 22 and 23 in each prescribed time.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for supplying power from a power supply to an excitation lamp of a solid-state pulsed laser using a drive switching circuit.

0002

2. Description of the Related Art Conventionally, in this type of power supply device, a drive switching circuit has a PFN circuit consisting of a choke coil and a capacitor connected to a power supply, and
It is known to include a thyristor or a transistor connected between the N circuit and the excitation lamp. In conventional power supplies where the drive switching circuit comprises a thyristor, the current pulse width to the excitation lamp is PF
In conventional power supplies where the drive switching circuit comprises a transistor, the current pulse width to the excitation lamp is determined by the O of the transistor.
Determined by N time.

0003

[Problems to be Solved by the Invention] However, in conventional power supply devices in which the drive switching circuit includes a thyristor, it is difficult to control the current pulse width to the excitation lamp, and it is difficult to control the pulse current within the pulse width. There is a problem in that it is impossible to control the waveform. Furthermore, in a conventional power supply device in which the drive switching circuit includes a transistor, it is possible to control the current pulse width to the excitation lamp and the pulse current waveform, but it is difficult to control the current with a pulse width of several ms or more. In this case, there is a problem in that the safety control range that can be supplied to the excitation lamp per transistor becomes low, and therefore a considerably large transistor is required. An object of the present invention is to be able to set the ON time of each switching element in the drive switching circuit to be short;
Moreover, it is an object of the present invention to provide a power supply device that can set a high safe operation area of a switching element.

0004

[Means for Solving the Problems] According to the present invention, electric power from a power source is supplied to a solid-state pulse laser by a driving switching circuit.
In the power supply device for supplying power to an excitation lamp, the drive switching circuit includes a capacitor connected to the power source, a plurality of switching elements connected in parallel between the capacitor and the excitation lamp, and a plurality of switching elements connected in parallel between the capacitor and the excitation lamp. A power supply device is obtained, comprising a control circuit that sequentially turns on switching elements at predetermined time intervals. Further, according to the present invention, in the power supply device for supplying power from a power supply to an excitation lamp of a solid-state pulsed laser by a drive switching circuit, the drive switching circuit includes a capacitor connected to the power supply, and a capacitor connected to the capacitor. It comprises a plurality of switching elements connected in parallel, a rectifying element connected in series between each of these switching elements and the excitation lamp, and a control circuit that sequentially turns on the switching elements at predetermined time intervals. A power supply device characterized by this is obtained.

[0005]

Embodiments Next, embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, reference numeral 1 indicates a charging power source. An excitation lamp 3 is connected to this charging power source 1 via a drive switching circuit 2 . This excitation lamp 3 is for excitation of a solid state pulse laser. A simmer power source 4 is connected to the excitation lamp 3. This simmer power supply 4 is for pre-ionizing the excitation lamp 3. The drive switching circuit 2 includes a capacitor 21 connected to the charging power source 1, a plurality of switching elements 22 and 23 connected in parallel to the capacitor 21, and a combination of each of these switching elements 2 and the excitation lamp 3. It consists of diodes 24 and 25 connected in series between them, and a control circuit 26 that sequentially turns on the switching elements 22 and 23 at predetermined time intervals. the switching element 22,
23 is composed of transistors 22T and 23T. The switching elements 22 and 23 may be composed of thyristors or the like. In the embodiment shown in FIG. 1, there are two transistors, but there may be three or more transistors.

The capacitor 21 is charged by the charging power source 1, and the charge of the capacitor 21 is transferred to the transistor 22.
It is supplied to the excitation lamp 3 via T, 23T. The control circuit 26 has an output terminal connected to the transistors 22T, 2
Connected to the 3T base. The control circuit 26 supplies the transistor 22T with a base current i as shown in FIG. 2(a).
2 and when the base current i3 as shown in FIG. 2(b) is applied to the transistor 23T, the current waveform of the current I supplied to the excitation lamp 3 becomes as shown in FIG. Note that if the control inputs of the base currents i2 and i3 to the transistors 22T and 23T overlap in time, the one with the higher base current is given priority.

Another embodiment of the invention is shown in FIG. The embodiment shown in FIG. 4 is different from the embodiment shown in FIG.
Add excitation lamp 3' and apply simmer to this excitation lamp 3'.
Connect the power supply 4', and connect the capacitor 21 and the excitation lamp 3.
', a series connection body of a transistor 27T and a diode 24', and a series connection body of a transistor 28T and a diode 25'.
´ and the series connection body are connected in parallel. An output terminal of a control circuit 26' is connected to the bases of the transistors 22T, 23T, 27T, and 28T. The control circuit 26' includes transistors 22T, 23T, 27T, 28
When supplying base currents i2, i3, i7, i8 as shown in FIGS. 5(a), (b), (c), and (d) to T, respectively, the sum of currents (I
1+I2), the current waveform becomes as shown in FIG.

[0008]

[Effects] The power supply device of the present invention can set the ON time of each switching element in the drive switching circuit to be short, and therefore can set the safe operation area of the switching element to be high.

[Brief explanation of the drawing]

FIG. 1 is an electrical circuit diagram showing an electrical circuit of one embodiment of the present invention.

2 is a current waveform diagram showing an example of a base current of a transistor in the embodiment of FIG. 1; FIG.

FIG. 3 is a current waveform diagram showing an example of the current flowing through the excitation lamp in the embodiment of FIG. 1;

FIG. 4 is an electrical circuit diagram showing an electrical circuit according to another embodiment of the present invention.

5 is a current waveform diagram showing an example of a base current of a transistor in the embodiment of FIG. 4; FIG.

6 is a current waveform diagram showing an example of the current flowing through the excitation lamp in the embodiment of FIG. 4. FIG.

[Explanation of symbols]

1 Charging power supply 2 Drive switching circuit 3 Excitation lamp 21 Capacitor 22, 23 Switching element 24, 25 Diode

Claims (2)

[Claims] 1. A power supply device that supplies power from a power supply to an excitation lamp of a solid-state pulsed laser by a drive switching circuit, wherein the drive switching circuit includes a capacitor connected to the power supply, and a capacitor and the excitation lamp connected to the power supply. 1. A power supply device comprising: a plurality of switching elements connected in parallel between a plurality of switching elements; and a control circuit that sequentially turns on these switching elements at predetermined time intervals. 2. A power supply device that supplies power from a power supply to an excitation lamp of a solid-state pulsed laser by a drive switching circuit, wherein the drive switching circuit includes a capacitor connected to the power supply, and a plurality of capacitors connected in parallel with the capacitor. , a rectifier connected in series between each of these switching elements and the excitation lamp, and a control circuit that sequentially turns on the switching elements at predetermined intervals. power supply equipment.